1. Don't use tobacco. Smoking has been linked to various types of cancer — including cancer of the lung, mouth, throat, larynx, pancreas, bladder, cervix, and kidney. Chewing tobacco has been linked to cancer of the oral cavity and pancreas. Even if you don't use tobacco, exposure to secondhand smoke might increase your risk of lung cancer.
   
   
2. Exercising half hour per day for at least five days a week – like brisk walking, cycling decreases the risk of cancer.
3. Early dinner, at least two hours before sleep time has shown to decrease risk of breast cancer and prostate cancer. Besides this, they have a beneficial effect on body metabolism also.
4. Use sunscreen before going outside which helps to reduce risk of skin cancers
5. Vaccination against HPV to prevent cervical cancer for females. Vaccination can be given to females as young as 9 years as well as in those aged 13–26 years who have not previously completed vaccination.
6. Vaccination against Hepatitis B to prevent liver cancer
7. Avoid alcohol, it helps to lower the risk of breast, colon, liver, and cancer of food pipe. If you drink alcohol, limit your daily intake to two drinks for men and one drink for women.
8. Avoid obesity, maintaining a healthy body weight lowers the risk of breast cancer, liver cancer, kidney cancer. Be as lean as possible without becoming underweight. men's waists are no larger than 37 inches and women's waists are 31.5 inches or less.
9. Eating no more than 455g cooked RED meat (including beef, pork, and lamb) per week. This is equal to 700g of raw meat. This could be a small 65g serve of cooked meat each day or 2 serves (130g) 3-4 times a week.
10. Eat a variety of vegetables, fruits, whole grains, and legumes (such as beans). Fruits and veggies have anticancer properties because they're high in nutrients and fiber, and low in fat. Try Broccoli, Brussels sprouts, Cabbage, Kale, Watercress, or other cruciferous vegetables, Or eat colorful berries. They protect against DNA damage that can turn cells cancerous. MORE COLORFUL IS THE PLATE –BETTER IT IS for health including cancer risk reduction.
11. Cut out processed meats altogether or keep them to an absolute minimum. Processed meats include etc. Replace processed meat such as bacon, ham, salami, prosciutto, or pepperoni with chicken, mushrooms, eggplant, tomato, capsicum, baked beans, or cheese.
12. Look at the ingredients list and avoid meats that contain nitrates or nitrites. Current research shows that there are certain chemicals in red and processed meats – both added and naturally occurring – that cause these foods to be carcinogenic. For example, when a chemical in red meat called haem is broken down in the gut, N-nitroso chemicals are formed and these have been found to damage the cells that line the bowel, which can lead to bowel cancer. These same chemicals also form when processed meat is digested. In addition, the nitrite and nitrate preservatives used to preserve processed meat produce these N-nitroso chemicals and can lead to bowel cancer.
13. Contact your doctor for breast cancer, cervical cancer, colon cancer screening, and screening for oral cancers if you are a smoker or tobacco chewer.

What is most important is to know that these tips reduce the risk of cancer occurrence- but not eliminate it. Apart from these factors, there are many reasons to keep in mind that these tips are about reducing -- but not eliminating -- cancer risk. Many factors, including genes and environmental factors, affect cancer risk; diet and exercise aren't the whole story, but they're within your power to change.